Move some code around.

Move logs:SignalHandlers to core/crash_reports:CrashReports.
Move all pre-launch windows to core/crash_report_window module.
Move some global code to core/launcher:Launcher.
It should replace settings / platform_specific module in some way.

Telegram/SourceFiles/main.cpp

@@ -18,49 +18,9 @@ to link the code of portions of this program with the OpenSSL library.
 Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
 Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
 */
-#include "application.h"
-#include "platform/platform_specific.h"
-#include "storage/localstorage.h"
+#include "core/launcher.h"
 
 int main(int argc, char *argv[]) {
-#ifndef Q_OS_MAC // Retina display support is working fine, others are not.
-	QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling, true);
-#endif // Q_OS_MAC
-	QCoreApplication::setApplicationName(qsl("TelegramDesktop"));
-
-	InitFromCommandLine(argc, argv);
-	if (cLaunchMode() == LaunchModeFixPrevious) {
-		return psFixPrevious();
-	} else if (cLaunchMode() == LaunchModeCleanup) {
-		return psCleanup();
-	}
-
-	// both are finished in Application::closeApplication
-	Logs::start(); // must be started before Platform is started
-	Platform::start(); // must be started before QApplication is created
-
-	int result = 0;
-	{
-		Application app(argc, argv);
-		result = app.exec();
-	}
-
-	DEBUG_LOG(("Telegram finished, result: %1").arg(result));
-
-#ifndef TDESKTOP_DISABLE_AUTOUPDATE
-	if (cRestartingUpdate()) {
-		DEBUG_LOG(("Application Info: executing updater to install update..."));
-		psExecUpdater();
-	} else
-#endif // !TDESKTOP_DISABLE_AUTOUPDATE
-	if (cRestarting()) {
-		DEBUG_LOG(("Application Info: executing Telegram, because of restart..."));
-		psExecTelegram();
-	}
-
-	SignalHandlers::finish();
-	Platform::finish();
-	Logs::finish();
-
-	return result;
+	const auto launcher = Core::Launcher::Create(argc, argv);
+	return launcher ? launcher->exec() : 1;
 }